Hello:
This is an issue with defraggler 1.09.138: when you start it and after you insert a removable media (SD/USB...), statistics of the newly inserted media are not shown (File System = unknown, Capacity=0, Used=0, Free=0, Fragmentation=unknown, Status=ready).
Of course device can be defragmented, but stats still are zero. You must restart defraggler with the media inserted in order to see its stats.
Thanks!